drivers/gpu/drm/exynos/exynos_drm_gem.c

   1 /* exynos_drm_gem.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Author: Inki Dae <[email protected]>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <drm/drmP.h>
  13 #include <drm/drm_vma_manager.h>
  14
  15 #include <linux/shmem_fs.h>
  16 #include <linux/dma-buf.h>
  17 #include <linux/pfn_t.h>
  18 #include <drm/exynos_drm.h>
  19
  20 #include "exynos_drm_drv.h"
  21 #include "exynos_drm_gem.h"
  22 #include "exynos_drm_iommu.h"
  23
  24 static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
  25 {
  26         struct drm_device *dev = exynos_gem->base.dev;
  27         enum dma_attr attr;
  28         unsigned int nr_pages;
  29         struct sg_table sgt;
  30         int ret = -ENOMEM;
  31
  32         if (exynos_gem->dma_addr) {
  33                 DRM_DEBUG_KMS("already allocated.\n");
  34                 return 0;
  35         }
  36
  37         init_dma_attrs(&exynos_gem->dma_attrs);
  38
  39         /*
  40          * if EXYNOS_BO_CONTIG, fully physically contiguous memory
  41          * region will be allocated else physically contiguous
  42          * as possible.
  43          */
  44         if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
  45                 dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs);
  46
  47         /*
  48          * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
  49          * else cachable mapping.
  50          */
  51         if (exynos_gem->flags & EXYNOS_BO_WC ||
  52                         !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
  53                 attr = DMA_ATTR_WRITE_COMBINE;
  54         else
  55                 attr = DMA_ATTR_NON_CONSISTENT;
  56
  57         dma_set_attr(attr, &exynos_gem->dma_attrs);
  58         dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs);
  59
  60         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  61
  62         exynos_gem->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
  63         if (!exynos_gem->pages) {
  64                 DRM_ERROR("failed to allocate pages.\n");
  65                 return -ENOMEM;
  66         }
  67
  68         exynos_gem->cookie = dma_alloc_attrs(dev->dev, exynos_gem->size,
  69                                              &exynos_gem->dma_addr, GFP_KERNEL,
  70                                              &exynos_gem->dma_attrs);
  71         if (!exynos_gem->cookie) {
  72                 DRM_ERROR("failed to allocate buffer.\n");
  73                 goto err_free;
  74         }
  75
  76         ret = dma_get_sgtable_attrs(dev->dev, &sgt, exynos_gem->cookie,
  77                                     exynos_gem->dma_addr, exynos_gem->size,
  78                                     &exynos_gem->dma_attrs);
  79         if (ret < 0) {
  80                 DRM_ERROR("failed to get sgtable.\n");
  81                 goto err_dma_free;
  82         }
  83
  84         if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
  85                                              nr_pages)) {
  86                 DRM_ERROR("invalid sgtable.\n");
  87                 ret = -EINVAL;
  88                 goto err_sgt_free;
  89         }
  90
  91         sg_free_table(&sgt);
  92
  93         DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
  94                         (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
  95
  96         return 0;
  97
  98 err_sgt_free:
  99         sg_free_table(&sgt);
 100 err_dma_free:
 101         dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
 102                        exynos_gem->dma_addr, &exynos_gem->dma_attrs);
 103 err_free:
 104         drm_free_large(exynos_gem->pages);
 105
 106         return ret;
 107 }
 108
 109 static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
 110 {
 111         struct drm_device *dev = exynos_gem->base.dev;
 112
 113         if (!exynos_gem->dma_addr) {
 114                 DRM_DEBUG_KMS("dma_addr is invalid.\n");
 115                 return;
 116         }
 117
 118         DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
 119                         (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
 120
 121         dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
 122                         (dma_addr_t)exynos_gem->dma_addr,
 123                         &exynos_gem->dma_attrs);
 124
 125         drm_free_large(exynos_gem->pages);
 126 }
 127
 128 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
 129                                         struct drm_file *file_priv,
 130                                         unsigned int *handle)
 131 {
 132         int ret;
 133
 134         /*
 135          * allocate a id of idr table where the obj is registered
 136          * and handle has the id what user can see.
 137          */
 138         ret = drm_gem_handle_create(file_priv, obj, handle);
 139         if (ret)
 140                 return ret;
 141
 142         DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
 143
 144         /* drop reference from allocate - handle holds it now. */
 145         drm_gem_object_unreference_unlocked(obj);
 146
 147         return 0;
 148 }
 149
 150 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
 151 {
 152         struct drm_gem_object *obj = &exynos_gem->base;
 153
 154         DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
 155
 156         /*
 157          * do not release memory region from exporter.
 158          *
 159          * the region will be released by exporter
 160          * once dmabuf's refcount becomes 0.
 161          */
 162         if (obj->import_attach)
 163                 drm_prime_gem_destroy(obj, exynos_gem->sgt);
 164         else
 165                 exynos_drm_free_buf(exynos_gem);
 166
 167         /* release file pointer to gem object. */
 168         drm_gem_object_release(obj);
 169
 170         kfree(exynos_gem);
 171 }
 172
 173 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
 174                                                 unsigned int gem_handle,
 175                                                 struct drm_file *file_priv)
 176 {
 177         struct exynos_drm_gem *exynos_gem;
 178         struct drm_gem_object *obj;
 179
 180         obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
 181         if (!obj) {
 182                 DRM_ERROR("failed to lookup gem object.\n");
 183                 return 0;
 184         }
 185
 186         exynos_gem = to_exynos_gem(obj);
 187
 188         drm_gem_object_unreference_unlocked(obj);
 189
 190         return exynos_gem->size;
 191 }
 192
 193 static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
 194                                                   unsigned long size)
 195 {
 196         struct exynos_drm_gem *exynos_gem;
 197         struct drm_gem_object *obj;
 198         int ret;
 199
 200         exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
 201         if (!exynos_gem)
 202                 return ERR_PTR(-ENOMEM);
 203
 204         exynos_gem->size = size;
 205         obj = &exynos_gem->base;
 206
 207         ret = drm_gem_object_init(dev, obj, size);
 208         if (ret < 0) {
 209                 DRM_ERROR("failed to initialize gem object\n");
 210                 kfree(exynos_gem);
 211                 return ERR_PTR(ret);
 212         }
 213
 214         ret = drm_gem_create_mmap_offset(obj);
 215         if (ret < 0) {
 216                 drm_gem_object_release(obj);
 217                 kfree(exynos_gem);
 218                 return ERR_PTR(ret);
 219         }
 220
 221         DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
 222
 223         return exynos_gem;
 224 }
 225
 226 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
 227                                              unsigned int flags,
 228                                              unsigned long size)
 229 {
 230         struct exynos_drm_gem *exynos_gem;
 231         int ret;
 232
 233         if (flags & ~(EXYNOS_BO_MASK)) {
 234                 DRM_ERROR("invalid flags.\n");
 235                 return ERR_PTR(-EINVAL);
 236         }
 237
 238         if (!size) {
 239                 DRM_ERROR("invalid size.\n");
 240                 return ERR_PTR(-EINVAL);
 241         }
 242
 243         size = roundup(size, PAGE_SIZE);
 244
 245         exynos_gem = exynos_drm_gem_init(dev, size);
 246         if (IS_ERR(exynos_gem))
 247                 return exynos_gem;
 248
 249         /* set memory type and cache attribute from user side. */
 250         exynos_gem->flags = flags;
 251
 252         ret = exynos_drm_alloc_buf(exynos_gem);
 253         if (ret < 0) {
 254                 drm_gem_object_release(&exynos_gem->base);
 255                 kfree(exynos_gem);
 256                 return ERR_PTR(ret);
 257         }
 258
 259         return exynos_gem;
 260 }
 261
 262 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
 263                                 struct drm_file *file_priv)
 264 {
 265         struct drm_exynos_gem_create *args = data;
 266         struct exynos_drm_gem *exynos_gem;
 267         int ret;
 268
 269         exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
 270         if (IS_ERR(exynos_gem))
 271                 return PTR_ERR(exynos_gem);
 272
 273         ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
 274                                            &args->handle);
 275         if (ret) {
 276                 exynos_drm_gem_destroy(exynos_gem);
 277                 return ret;
 278         }
 279
 280         return 0;
 281 }
 282
 283 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 284                                         unsigned int gem_handle,
 285                                         struct drm_file *filp)
 286 {
 287         struct exynos_drm_gem *exynos_gem;
 288         struct drm_gem_object *obj;
 289
 290         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 291         if (!obj) {
 292                 DRM_ERROR("failed to lookup gem object.\n");
 293                 return ERR_PTR(-EINVAL);
 294         }
 295
 296         exynos_gem = to_exynos_gem(obj);
 297
 298         return &exynos_gem->dma_addr;
 299 }
 300
 301 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 302                                         unsigned int gem_handle,
 303                                         struct drm_file *filp)
 304 {
 305         struct drm_gem_object *obj;
 306
 307         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 308         if (!obj) {
 309                 DRM_ERROR("failed to lookup gem object.\n");
 310                 return;
 311         }
 312
 313         drm_gem_object_unreference_unlocked(obj);
 314
 315         /*
 316          * decrease obj->refcount one more time because we has already
 317          * increased it at exynos_drm_gem_get_dma_addr().
 318          */
 319         drm_gem_object_unreference_unlocked(obj);
 320 }
 321
 322 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
 323                                       struct vm_area_struct *vma)
 324 {
 325         struct drm_device *drm_dev = exynos_gem->base.dev;
 326         unsigned long vm_size;
 327         int ret;
 328
 329         vma->vm_flags &= ~VM_PFNMAP;
 330         vma->vm_pgoff = 0;
 331
 332         vm_size = vma->vm_end - vma->vm_start;
 333
 334         /* check if user-requested size is valid. */
 335         if (vm_size > exynos_gem->size)
 336                 return -EINVAL;
 337
 338         ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem->pages,
 339                              exynos_gem->dma_addr, exynos_gem->size,
 340                              &exynos_gem->dma_attrs);
 341         if (ret < 0) {
 342                 DRM_ERROR("failed to mmap.\n");
 343                 return ret;
 344         }
 345
 346         return 0;
 347 }
 348
 349 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 350                                       struct drm_file *file_priv)
 351 {
 352         struct exynos_drm_gem *exynos_gem;
 353         struct drm_exynos_gem_info *args = data;
 354         struct drm_gem_object *obj;
 355
 356         mutex_lock(&dev->struct_mutex);
 357
 358         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 359         if (!obj) {
 360                 DRM_ERROR("failed to lookup gem object.\n");
 361                 mutex_unlock(&dev->struct_mutex);
 362                 return -EINVAL;
 363         }
 364
 365         exynos_gem = to_exynos_gem(obj);
 366
 367         args->flags = exynos_gem->flags;
 368         args->size = exynos_gem->size;
 369
 370         drm_gem_object_unreference(obj);
 371         mutex_unlock(&dev->struct_mutex);
 372
 373         return 0;
 374 }
 375
 376 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 377                                 struct sg_table *sgt,
 378                                 enum dma_data_direction dir)
 379 {
 380         int nents;
 381
 382         mutex_lock(&drm_dev->struct_mutex);
 383
 384         nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 385         if (!nents) {
 386                 DRM_ERROR("failed to map sgl with dma.\n");
 387                 mutex_unlock(&drm_dev->struct_mutex);
 388                 return nents;
 389         }
 390
 391         mutex_unlock(&drm_dev->struct_mutex);
 392         return 0;
 393 }
 394
 395 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 396                                 struct sg_table *sgt,
 397                                 enum dma_data_direction dir)
 398 {
 399         dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 400 }
 401
 402 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
 403 {
 404         exynos_drm_gem_destroy(to_exynos_gem(obj));
 405 }
 406
 407 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 408                                struct drm_device *dev,
 409                                struct drm_mode_create_dumb *args)
 410 {
 411         struct exynos_drm_gem *exynos_gem;
 412         unsigned int flags;
 413         int ret;
 414
 415         /*
 416          * allocate memory to be used for framebuffer.
 417          * - this callback would be called by user application
 418          *      with DRM_IOCTL_MODE_CREATE_DUMB command.
 419          */
 420
 421         args->pitch = args->width * ((args->bpp + 7) / 8);
 422         args->size = args->pitch * args->height;
 423
 424         if (is_drm_iommu_supported(dev))
 425                 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
 426         else
 427                 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
 428
 429         exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
 430         if (IS_ERR(exynos_gem)) {
 431                 dev_warn(dev->dev, "FB allocation failed.\n");
 432                 return PTR_ERR(exynos_gem);
 433         }
 434
 435         ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
 436                                            &args->handle);
 437         if (ret) {
 438                 exynos_drm_gem_destroy(exynos_gem);
 439                 return ret;
 440         }
 441
 442         return 0;
 443 }
 444
 445 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 446                                    struct drm_device *dev, uint32_t handle,
 447                                    uint64_t *offset)
 448 {
 449         struct drm_gem_object *obj;
 450         int ret = 0;
 451
 452         mutex_lock(&dev->struct_mutex);
 453
 454         /*
 455          * get offset of memory allocated for drm framebuffer.
 456          * - this callback would be called by user application
 457          *      with DRM_IOCTL_MODE_MAP_DUMB command.
 458          */
 459
 460         obj = drm_gem_object_lookup(dev, file_priv, handle);
 461         if (!obj) {
 462                 DRM_ERROR("failed to lookup gem object.\n");
 463                 ret = -EINVAL;
 464                 goto unlock;
 465         }
 466
 467         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 468         DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
 469
 470         drm_gem_object_unreference(obj);
 471 unlock:
 472         mutex_unlock(&dev->struct_mutex);
 473         return ret;
 474 }
 475
 476 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 477 {
 478         struct drm_gem_object *obj = vma->vm_private_data;
 479         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 480         unsigned long pfn;
 481         pgoff_t page_offset;
 482         int ret;
 483
 484         page_offset = ((unsigned long)vmf->virtual_address -
 485                         vma->vm_start) >> PAGE_SHIFT;
 486
 487         if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
 488                 DRM_ERROR("invalid page offset\n");
 489                 ret = -EINVAL;
 490                 goto out;
 491         }
 492
 493         pfn = page_to_pfn(exynos_gem->pages[page_offset]);
 494         ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
 495                         __pfn_to_pfn_t(pfn, PFN_DEV));
 496
 497 out:
 498         switch (ret) {
 499         case 0:
 500         case -ERESTARTSYS:
 501         case -EINTR:
 502                 return VM_FAULT_NOPAGE;
 503         case -ENOMEM:
 504                 return VM_FAULT_OOM;
 505         default:
 506                 return VM_FAULT_SIGBUS;
 507         }
 508 }
 509
 510 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 511 {
 512         struct exynos_drm_gem *exynos_gem;
 513         struct drm_gem_object *obj;
 514         int ret;
 515
 516         /* set vm_area_struct. */
 517         ret = drm_gem_mmap(filp, vma);
 518         if (ret < 0) {
 519                 DRM_ERROR("failed to mmap.\n");
 520                 return ret;
 521         }
 522
 523         obj = vma->vm_private_data;
 524         exynos_gem = to_exynos_gem(obj);
 525
 526         DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
 527
 528         /* non-cachable as default. */
 529         if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
 530                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 531         else if (exynos_gem->flags & EXYNOS_BO_WC)
 532                 vma->vm_page_prot =
 533                         pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 534         else
 535                 vma->vm_page_prot =
 536                         pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 537
 538         ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
 539         if (ret)
 540                 goto err_close_vm;
 541
 542         return ret;
 543
 544 err_close_vm:
 545         drm_gem_vm_close(vma);
 546
 547         return ret;
 548 }
 549
 550 /* low-level interface prime helpers */
 551 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
 552 {
 553         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 554         int npages;
 555
 556         npages = exynos_gem->size >> PAGE_SHIFT;
 557
 558         return drm_prime_pages_to_sg(exynos_gem->pages, npages);
 559 }
 560
 561 struct drm_gem_object *
 562 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 563                                      struct dma_buf_attachment *attach,
 564                                      struct sg_table *sgt)
 565 {
 566         struct exynos_drm_gem *exynos_gem;
 567         int npages;
 568         int ret;
 569
 570         exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
 571         if (IS_ERR(exynos_gem)) {
 572                 ret = PTR_ERR(exynos_gem);
 573                 return ERR_PTR(ret);
 574         }
 575
 576         exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
 577
 578         npages = exynos_gem->size >> PAGE_SHIFT;
 579         exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *));
 580         if (!exynos_gem->pages) {
 581                 ret = -ENOMEM;
 582                 goto err;
 583         }
 584
 585         ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
 586                                                npages);
 587         if (ret < 0)
 588                 goto err_free_large;
 589
 590         exynos_gem->sgt = sgt;
 591
 592         if (sgt->nents == 1) {
 593                 /* always physically continuous memory if sgt->nents is 1. */
 594                 exynos_gem->flags |= EXYNOS_BO_CONTIG;
 595         } else {
 596                 /*
 597                  * this case could be CONTIG or NONCONTIG type but for now
 598                  * sets NONCONTIG.
 599                  * TODO. we have to find a way that exporter can notify
 600                  * the type of its own buffer to importer.
 601                  */
 602                 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
 603         }
 604
 605         return &exynos_gem->base;
 606
 607 err_free_large:
 608         drm_free_large(exynos_gem->pages);
 609 err:
 610         drm_gem_object_release(&exynos_gem->base);
 611         kfree(exynos_gem);
 612         return ERR_PTR(ret);
 613 }
 614
 615 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
 616 {
 617         return NULL;
 618 }
 619
 620 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 621 {
 622         /* Nothing to do */
 623 }